I think the main reason this race was competitive is that California Republicans had few reasons to go to the polls in 2016 because everyone knew Hillary was going to carry the state and the Senate race was a non-starter in that it was essentially a runoff between two Dems. I think that’s one of the main reasons Trump did so poorly in California and thus inflated Hillary’s lead. That and the strong likelihood of illegals and non-citizens being allowed to vote.
I’m in Issa’s district in SD county ty. The other guy had military experience. Also ISSA supported Trump. This IS Cal even though we have more military than most. The fact that Issa survived when Cal went overwhelmingly democrat (name doesn’t help either) is a triumph.
She called on us the day after the election and said her office was full of crying, bewildered people who couldn't believe what happened.